So i found something interesting today. While i was bored waiting for some people i started taking apart my dash. To my discovery i found a Dallas Mustang SpeedCal all hooked up under, and i never noticed it before. Ive owned the car for a few months now, and after looking up the code for the panel on the inside of the speedcal i learned my car has 3.73 gears installed. Now for Xmas my mom got me 410's. My question to you guys is although it may not be till winter or next summer when i go with a blower. Do you guys think i should swap in my 4.10's or sell the 4.10s and leave in the 3.73's??
what to do....
- Thread starter 02TruBlueGt
- Start date
streetstang03
unModerator
AmBo
Active Member
3.73s are awesome for a vortech. You could run 4.10s, but traction may be an issue and you may have to shift to 5th if you run at the track. 
steveb24
New Member
LaserRed01GT
Banned
four six
Member
whyask
New Member
same when i bought mine....were did you find the spedcal, ?...and sell the gears if your going blown....i jumped down to 3:90's ..nice medium
If your going FI I'd sell me the 4.10s and stay with FI friendly 3.73s
If you make me an off go ahead and PM me i may have a local buyer at 150 but if you want to up it to say 165 shipped we may have a deal.
For everyone wanting to know where i found my speed cal here is a pic. It was behind the shifter tucked all the way back. I got curious about that black wrapped wire and pulled it out.
View attachment 399997
four six
Member
Give Me TP
Member
Yack up your rear axle and count DS revolutions per rear wheel turn, and hope your speedo is corrected if you do have 3.73's or better.
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